Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius...

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Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM

Transcript of Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius...

Page 1: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Department of Physics

Kyoto University

Tetsuya MURAKAMI

HIMAC Pion Experiment and Pb Isotope Radius Measurements

Pion Ratios and ESYM

Page 2: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Neutron Star vs Nuclear EOS

E/A

Density (ρB)

L

ρ0 2ρ0

(nucleon,electron,μ)

(nucleon,hyperon,meson,quark)

PhaseTransition

High Density

Low Density

EOS

Mass

Radius

Low Density

High Density

Mass Limit

Observations of Mass and RadiusPhase

Transition

MR(Mass-Radius) Relation

TOV equation

Tolman–Oppenheimer–Volkoff equation

Page 3: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Useful Notations

3LKK

EK

EL

ES

EK

KLEE

KEE

EEE

sym

symsym

sym

sym

pn

symsymsym

sym

6

)(9

)(3

)(

3/)(

/)(

)0,(9

)(2

)()(

)(2

)0,()0,(

)()()0,(),(

0

0

0

2

220

0

0

00

2

2200

320

3200

42

Page 4: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

It started in 2000 from Alex`s paper, PRL85, 5296 (2000)

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He urged experimentalists to measure a neutron skin thickness of 208Pb precisely.

We challenge to ALEX and PREX.

Page 5: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Neutron Density Distributions of Pb Isotopes

From J. Zenihiro’s PhD thesis 2011

PRC82, 054607 (2010)

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RCNP, Osaka University

Polarized Proton beams of 295 MeVTypical polarization ~75%

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Page 8: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Analysis

Relativistic Impulse Approximation developed by Murdock and Horowittz (MH)

Realistic point proton density distribution deduced from electron scattering data

Scalar density = 0.96 Vector density Neutron density = Sum of Gaussian

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Page 12: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

054.0063.0

208

048.0064.0

206

047.0059.0

204

211.0

180.0

178.0

)(

Pb

Pb

Pb

fmrnp

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S=33.0±1.1 MeVL=67.0±12.1 MeV

Page 15: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

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Li et al.(2009)

Page 16: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Summary of neutron skin thickness

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054.0063.0

208

048.0064.0

206

047.0059.0

204

211.0

180.0

178.0

)(

Pb

Pb

Pb

fmrnp

S=33.0±1.1 MeVL=67.0±12.1 MeV

Unfortunately, doesn`t look like sufficiently precise.

Page 17: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

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ESPRI (Elastic Scattering of Proton with RI beam) Project

One of Future Directions

• Beam line MWDCs• Solid hydrogen target (1mm thick)• Large MWDCs for recoil protons• Array of 14 NaI(Tl)• Array of Silicon Strip Detectors

We have measured elastic scatterings on 20O, 9-11C, and 66,70Ni.

Page 18: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

According to Bao-An’s calculation from NPA 708 (2002) 365.

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Page 20: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Au+Au

?

MSU

RIBF

GSI

Isospin diffusion, n-p flow

Pion production

Xia

o, e

t al., a

rXiv

:08

08

.01

86

(20

08

)R

eis

do

rf, et a

l., NP

A 7

81

(20

07

) 45

9.

S=33.0±1.1 MeVL=67.0±12.1 MeVKsym=-148±124 MeV

Page 21: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

HIMAC Pion Experiments Details will be presented by Mr. Sako

tomorrow. Our on-going SAMURAI-TPC project

along the same direction will be presented by Dr. Isobe this afternoon.

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Page 22: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Using Minimum Setup Centrality Filter

Multiplicity filter for Charged Particles

Portable, If possible. Pion Detector

Simple and portable system

HIMAC

Page 23: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Performed Experiments

2008.11In

(Pb)132Xe 400

MeV/u

2009.7In

(Pb) 28Si 400

MeV/u

2009.10In

(Pb) 28Si 600

MeV/u

2009.11 In 28Si 800 MeV/u

Target Beam energy 30deg 45deg 60deg 75deg 90deg 120deg

○○○○○○

○○○○○○

○○○○○

○○○○

Page 24: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Beam Energy Dependence : Silo

g s

cale

 π

- /π+

Erapπ (MeV)

400 MeV 600 MeV

800 MeV

● 45deg■ 60deg▼ 90deg○ 120deg

Slopes depend on Beam Energy

Fitting : C*X-a

slope α:• 400 : (4.5±0.5)×10-1

• 600 : (3.2±0.5)×10-1

• 800 : (2.0±0.5)×10-1

log

sca

le  

π- /π

+

log

sca

le  

π- /π

+

Page 25: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

If we are lucky, we are going to measure pions from 129,132,136Xe on CsI reactions at 400 MeV/u in FY2011.

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Please  come back  for Mr. Sako‘s talk

Thank you

Page 26: Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius Measurements Pion Ratios and ESYM.

Members of Collaboration

RCNP E248 Collaboration Kyoto University

J. Zenihiro, Y. Iwao,

H. Sakaguchi, S. Terashima,

Y. Yasuda, M. Yosoi Research Center for Nuclear

Physics

M. Itoh, M. Uchida, H.P. Yoshida

HIMAC P226 Collaboration Kyoto University

M. Sako, S. Ebesu, Y. Ichikawa, S. Imajo,

R. Sameshima Rikkyo University

K. Ieki, Y. Ikeda, H.

Kawamura, M. Matsushita, J. Murata, M. Nitta, T. Toyoda

RIKEN Nishina Center

Y. Nakai, S. Nishimura NIRS

E. Takada,

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